Introduction to Microcomputer Protection DevicesDigital Relay Protection
The bidding for relay protection and substation computer monitoring systems (four times in total, excluding safety and stability devices), the proportion and data of each enterprise's winning bid amount are as follows:
NARI Relays, NARI Technology, Beijing Sifang, XJ Electric, Guodian Nanzhi, and CYG Sunri are the mainstream "six major manufacturers" in China. NARI Relays remains in the lead, while the rankings of the other five often change.
The comparison of the winning bid amounts of each manufacturer in the first eight months of 2021 is as follows: NARI Relays is still first, significantly ahead of other manufacturers. Guodian Nanzhi and CYG Sunri still need to work harder.
The "six major manufacturers" in the domestic mainstream account for 92% of the total winning bid amount, while other manufacturers account for less than 8%.
Manufacturers under State Grid Corporation (NARI Relays, NARI Technology, XJ Electric, etc.) account for 60% of the total winning bid amount.
Manufacturers located in Nanjing (NARI Relays, NARI Technology, Guodian Nanzhi, Nanjing Panneng, Wiscom System, Nanjing Electric Research) account for 57% of the total winning bid amount, more than half. Nanjing can be called China's "Capital of Relay Protection".
1. What is a relay protection device? Answer: When a power system component (such as a generator, line, etc.) or the power system itself fails and endangers the power system
Reasonable personnel allocation enables smooth personnel dispatch and assistance, ensuring normal power operation.
When designing manual and automatic voltage switching circuits, effective measures should be taken to prevent back-charging of the voltage transformer that has been de-energized on the primary side during the switching process.
The entire protection has few intermediate links, especially for nearby faults, it can achieve fast action, which is conducive to reducing developing faults.
April Electrical Primary Equipment Testing and Fault Diagnosis Technology Seminar April 21, 2021 - April 26, 2021 ★ Hangzhou April Relay Protection and Excitation System
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Scenario diversification,
